as president obama called nelson mandela the last great liberator of the 20th century. >> it was precisely because he could admit to imperfection. because he could be so full of good humor, even mischief. despite the heavy burdens that he carried, that we love him so. >> one other note of interest from the ceremony. president obama, you see this here. before his eulogy, shook hands with cuban president raul castro. the president leaves south africa this afternoon. >>> here at home, a new round of snow, shutting down the government and a whole lot else. a half foot of snow on the way. as federal offices in the nation's capital have been closed. many schools closed, from virginia to new york. and ginger will have her complete snowy forecast in just moments. >>> and new evidence that some organic food may be better for us. researchers say that organic whole milk is healthier than conventional milk because it contains more of the fatty acids that contribute to a healthy heart. the research was funded, in part, by a farm group that sells organic products. but independent experts call the findin